HBASE-8519  Backup master will never come up if primary master dies during initialization
            (Jerry He via JD)


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HBASE-5995 Fix and reenable TestLogRolling.testLogRollOnPipelineRestart

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HBASE-7006 [MTTR] Improve Region Server Recovery Time - Distributed Log Replay; ADDENDUM

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HBASE-8540 SnapshotFileCache logs too many times if snapshot dir doesn't exists

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HBASE-5930 Addendum with tests. (Davaraj)

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